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China Current Transformer CTY Series - Reliable Power Monitoring Solutions from Leading Suppliers and Factory

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A current transformer (CT) is an essential electrical device used for controlling, monitoring, and safeguarding power supply systems. It accurately measures small, manageable portions of high-voltage alternating current (AC). In various applications including power generation, transmission, distribution, and industrial sectors, these high-current power circuits are often connected through safety relays or sensitive measurement devices. As a leading manufacturer and suppliers in China, our factory produces high-quality current transformers designed to meet the diverse needs of our global customers.

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    Product Details

    Product Overview

    A CT uses electromagnetic induction and consists of two windings: a secondary winding with several turns connected to safety or measurement devices, and a primary winding with a few turns connected in series to a high-current circuit. The secondary winding, which is typically tuned to 5A or 1A for the majority of industrial applications, gets minimal current while the primary winding receives a lot. This proportionality, also known as the transformation ratio, protects people and equipment from dangerous voltages while allowing for precise current monitoring.

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    Important Safety Note: The secondary winding should never be left open circuit while utilizing a CT. An open circuit may produce extraordinarily high voltages that could harm electrical equipment.

    🛡️ High Insulation Between Windings
    📐 Linearity to Reduce Measurement Error
    🎯 High Precision for Energy Metering
    🔍 Enhanced Problem Diagnostics

    CTs need sufficient insulation to sustain a high voltage between windings, linearity to reduce measurement error, and high precision for energy metering. Lastly, current transformers are essential to guaranteeing the dependability, effectiveness, and safety of contemporary electrical systems since they allow for more accurate current monitoring and enhanced problem diagnoses.

    Technical Parameters

    Type Specification Lead Length (mm) Outline Size
    c A B C D M
    CTY-45 100A / 5A 1m 45 79 84 24 66 c5*8
    CTY-65 250A / 5A 1m 65 100 104 24 86 c5*8
    CTY-80 400A / 5A 1m 80 114 119 26 101 c5*8
    CTY-100 630A / 5A 1m 100 136 141 26 114 c5*8
    Accuracy Grade: 0.5 Overload Current: ≥ 1.2% ln
    ℹ️ All outline dimensions are in millimeters (mm). Lead length is standard 1m for all models.

    Frequently Asked Questions

    Q
    What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) operates on the principle of electromagnetic induction. It consists of a primary winding connected in series with a high-current circuit and a secondary winding connected to measurement or safety devices. The primary winding carries the large current, while the secondary winding produces a proportionally reduced current — typically 5A or 1A — enabling safe and accurate current monitoring.
    Q
    Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, the CT will attempt to drive the full primary current through an open circuit, generating extraordinarily high voltages. These voltages can damage electrical equipment, cause insulation failure, and pose serious safety risks to personnel.
    Q
    What accuracy grade do these current transformers offer?
    These current transformers are rated at Accuracy Grade 0.5, which is suitable for precision energy metering and measurement applications. This grade ensures minimal measurement error and reliable performance in industrial environments.
    Q
    What current ratios are available in the CTY series?
    The CTY series offers four current ratio options to suit different application requirements: CTY-45 (100A/5A), CTY-65 (250A/5A), CTY-80 (400A/5A), and CTY-100 (630A/5A). All models feature a standard 1-meter lead length and a secondary output of 5A.
    Q
    What is the overload current specification for these CTs?
    The CTY series current transformers are designed to handle an overload current of ≥ 1.2% ln (rated current). This ensures the transformers remain reliable and accurate even under temporary overload conditions that may occur in industrial power systems.
    Q
    What are the key technical requirements for a reliable current transformer?
    A reliable current transformer must meet three essential technical requirements: (1) Sufficient insulation to sustain high voltages between the primary and secondary windings; (2) Linearity across its operating range to minimize measurement errors; and (3) High precision to ensure accurate energy metering and monitoring in industrial and commercial electrical systems.